Theory for the Load Relaxation Technique in Fracture Studies Using Four‐Point‐Bend Chevron‐Notched Specimens

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Abstract
The load‐relaxation technique is reviewed using the energy approach for four‐point‐bend chevron‐notched samples. The influence of the sample and bending geometry and the stiffness of the testing system on the strain‐energy release rate is considered. Proper experimental design allows the study of fracture initiation, propagation, and arrest, Special attention is paid to the effect of overload at fracture initiation on crack propagation. It is concluded that the chevron–notched sample offers great flexibility for gaining information on the fracture properties of ceramic materials.